Change-speed gearing



Filed oct. 23, 19,25 s sheeis-shet 1- INVENTOR.

.Agg. A18,.'1 925.

f 1,550,058 G. C. CARHART CHANGE SPEED GEARING Filed oct. 25. 19:25 3 sheets-sheet i2 I N VEN TOR.

' A TTORNEYS Aug. 18, 1925.

G. c. CARHART CHANGE `SPEED GEARING 3 Sheets- Sheet 5 Filed Oct. 25, 1923 INVENTOR.

A TTORNEYS` like characters designate' corresponding.

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'rA OFFICE..

GEORGE e. OARH'ART, or sYRAOUsE, NEW YORK, AssIGNOn To BROWN-LIEN editen.Y

COMPANY, or sYRAeUsE, NEW vomi, A CORPORATION or NEW YORK.

OHANGEHsPEEn GEARING.

Application led October 23, 1923. Serial No. 670,374.

To all whom it 'may concern:

Be it known that l, GEORGE. C. CARHART, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented a certain new and useful Change-Speed Gearing, of which thefollowingis a specification.

This invention relates to change speed gearing such as used in motor vehicles and' has for its Object a particularly simple and eficient construction by which lthe number of speed changes through interineshing gears of the usual sliding gear transmissions is doubled without/ substantially changing the construction of such transmis sion. y

The invention consists in the novel fea- 'tures and-n the combinations and construetioiis hereinafter set forth and claimed. y

-In describing this invention, reference is had to the accompanying drawings in which parts in all the views. l

Figure 1 is-a vertical sectional view of a gearing embodying my invention.

Figure 2 is a rear elevation partly broken Figureff is a plan-view partly broken away. .f

Figures 4 and 5 are detail views of a portion of the shifting mechanism forming part of this invention.

Figure 6 is a detail view of one of vthe gears on the drive shaft of this gearing.

This change speed gearing comprises generally driving` and driven shafts, a counter shaft, thedr'iving anddriven shafts being mounted in axial alinement in the main case, the counter shaft being mounted in the-main case parallel to the driving and driven shafts. change speed gears, some of. which are sliiftable. between the counter shaft and the' driven shaft, change speed gears, some of which are shifrtable. between the driving shaftand the counter shaft andmeans for shifting the shiftable gears. l

I have here shown my invention as embodied in a transmission gearing having low speed and two intermediate speeds forward, and reverse through intermeshing gears in addition to direct drive high speed, suoli invention operating to increase or double the speed changes effected through interiiieshiiig gears, so that. the, gearing has, in

2 is the driving shaft, which is connected i to the engine through the usual clutch, 3

is the driven shaft, and 4 the counter shaft,

the driving shaft extending at one end into the casing 1 and being Journalled near such end in bearings 5 supported in the end.-

wall G in the main case.

The driven shaft 3 isjournalled in a bearing 7 in the Opposite end wall 8 of the main `case and extends, at its rear end, outside of the' main case, 'where it 1s connected to the propeller shaft of the vehicle in any wellA known manner. The -driven shaft, at its innerend, is mounted in a bearing 9=inthe inner end of the driving shaft 2.v The-counter shaft 4 is mounted in bearings 10, 11 in the .opposite end walls 6 and 8 of the case and extends, at its front end, outside of the main case parallel to the driving shaft 2.

The driving shaft 2 is journalled, at its outer end, in a bearing 12 carried in a suit: able support 13, here shown asv tubular, this' support 13 being mounted in the opening in thc end wall 6 in which the bearing 5 is 'mounted In the ordinary gearing this bearing 5 is mounted in a ring or' cap through which the driving shaft extends and the support 13 is interchangeable with such cap and is mounted in the wallt, and the bearing 5 is mounted in the inner .end of the Support 13. with a suitable flange 14, overlying the Outer face ofthe wall of the main case 1, and the.

support is secured to the main case in arg1 suitable manner as by ca-p screws 15 exten ing through the flange 14 and into the Wall 6 of the case. Tlie'support 13 is additionally braced by a ease 16 mounted on the end wall '(j and secured thereto in any suitable manner as by cap screws 17, the case 16 having .an opening through which the support 13 extends, suoli opening fitting the support 13. The case 16 encloses gears on the driving and counter shafts outside of the main CaSe.

The support 13Ais provided` rllhe change speed gears between the driven shaft 3 and the counter shaft 4, some of which are shiftable, are of any Well known construction and, as here shown, comprise gears 18, 19 and 2O fixed to the counter shaft 4 to rotate therewith land slidable gears 21, 22 andy 23'mounted on the driven shaft 3. The gear 21 is formedwitha clutch face 24 for coacting With the clutch face 25 on the inner end of the driving shaft 2. Shifting of the gear 23 to the right into mesh with the gear produces low speed. Shifting of the gear 22 to the left into mesh with the gear 19 produces the next higih speed. Shifting of the gear 21 to the night into mesh with the gear 18 produces.

third speed forward, and shifting of the gear 21 to the left to engage the clutches 24, 25 produces direct drive high speed forward.

Reverse speed is obtained by shifting idler gears 2G, 27 indicated in vdotted lines, into vmesh with the gear 23, when in neutral position, and with the rear 2O respectively. These idler gears 2G, 2r are mounted upon a suitable shaft in the case at one side of the l counter shaft T4.

The sliiftable gears are selected and shifted by any' suitable mechanism. That here shown comprises forks 28, 29 and 30, carried by shifting rods 31, 32 and 33, which rods are mounted to slide in suitable guideways in the cover 34 of the niain case, and which are connected to a suitable selecting and shifting' means as a lever.

35, 3G are gears mounted lon the drive shaft 2, inside and outside of the main case. 37, 38 are gears mounted on, the counter shaft 4 inside and outside of the main case, the gears 37,'38 being shiftable in and out of mesh respectively with the gears 35 and 3G. The gear 36 is usually formed integral with the driving shaft 2. The gear 35 is mounted on the shaft 2 to rotate therewith and is here shown as formed with a cylindrical bore for fitting a c vlindrical part of the driving shaft 2, and with an annular [lange 39 on its inner side, which flange is formed with notches 40 for receiving splines 41 on the shaft 2. Suitably spaced collars 42, 43 ai'e inserted between `the hub of the gear 35 and the bearing 12, and between the bearing 12 and a nut 44 threaded on the shaft against the ring or collar 43.

During high speed. or direct drive, that is, when the clutch faces 2l, 25 are engagedbotli gears 37, 38 are in neutral position, and hence. the counter shaft 4 is idle. During the intermediate and reverse speeds, either the gear 38 is in mesh with the gear 36, or the gear 37 is in mesh with the gear 35.` Hence, owing to the gears`37, 38 the number of speed changes (not considering l n A u n high speed on the direct drive) is doubled.

The rears 37 38 are shifted b i a articularly simple shifting mechanism, which is readily applied lto the transmission gearing. This mechanism comprises a reversely movable actuator andmotion transmitting means between the actuator andthe gears 37, 38, such motion transmitting means being so connected to the actuator that movement ofthe actuator in one direction fromj'neutral, shifts one gear 37 and the movement of the actuator in the other direction fiom neutralshifts the other gear 38 The actuator is here shown as a rock shaft 45 suitably supported by the case and carrying the rock um 46 within the case, which rock arni is provided with a pair of spaced apart pins or followers 47, 48 'which are arranged on opposite sides of the axis of the shaft, so that, they move in opposite directions, that is, one pin moves upwardly while the other moves downwardly.

The motion transiiritting means comprises shifters, for the gears 37, 38 and cams connected to the shiftcrs and coacting with the pins or followers 47 and 48.

49, 50' designate the Shifters for the gears 37, 38 respectively, these sliifters being forks coacting with grooves .in the hubs of the gear 37, 38, such shifters 49, 50 are here shown as mounted upon endwisely -movable rods 51, 52, which rods have brackets 53, carrying the cam plates 55, The cani plates are provided with cani grooves therein .for receiving the followers or pins 47, 48. As here shown these cam' slots include concentric dwell 'portions 57 and active portions 58, the dwell portion 57 of each slot being. arranged opposite the ac tive por-tion 58 of the other slot, so that when the actuator 45 rocks iii one direction one pin will move in the active portion of one slot, and the othertpin will move in the dwell. port-ion of the other slot. Hence, rocking of the actuator 45 in one direction from neutral shifts the gear 37 into mesh with the gear 35;'y and movement of the. actuator 45 iii the other direction from neutral shifts the gear. 38 into mesh with the 'gear 3G, and while one gear 37 or 38 is heilig shifted the other remains idle. y

The rock `shaft 45 is here shown as supported in the cover 59 detachably mounted ou the side of the main case 1, and held in position -in any suitable iiiaiinei'. as by cap screws (SO. The shifter rods 51 slide endwisely iii guide openings in the end wall G of the main case, and in openings in brackets as (31, provided in the main case 1.

The shaft is provided at its outer end with a suitable lever (32 which is connected to a shifting lever not shown in any suitable uianner. The actuator is locked in neutraland in its shifted positions by a lock as a spring pressed poppet G3 carried in a recess in the cover 59 and coactingwith sockets 64 found in the outer face of the arm or sector 46. f

weones l The counter shaft l isvherefillustrated as off-set or out of the vertical plane of the driving and-driven shafts and as arranged opposite a' remov'ableplate 65 in the side `Wa1l of thekk casing opposite to that on which 1 ing, the off-set counter shaft facilitating the arrangement and'applications of the power take-off mechanism. 'Ihe off-set .counter shaft forms no part ofthis` invention.

rllhis transmission gearing is particularly advantageous 'in that the number of the speed changes outside of direct drive 1s doubled, lby an extremely' simple speed chang` ing mechanism applicable tothe ordinary change speed transmission gearing.

What I claim is:

l. In a change -speed transmission gearing, the combination of a main case, driving anddriven shafts, a counter shaft, the driving shaft being mounted at its inner end in a bearing in a Wall of the main case, and the drivenshaft being mounted in the case in alinement With the drivingshaft, the counter shaft beingl mounted in bearings in the main case, one'of which is in saidwall, the counter shaft extending through said Wall, change speed gears includiifg shiftable gears between the countershaft and the driven shaft, change speed gears including shiftable gears between the driving shaft and lthe counter shaft, located 0n opposite sides of said Wall,land. means for shifting the shiftable gears.

2. In a change speed gearing, the combination'of a main ease, a driving shaft journalled in'a Wall of the main lcase and having a pair of gears thereon located on opposite sides of said Wall, adriven shaft journalled in the case in axial alinement with the driving shaft, a counter shaft journalled in bearings in the main case,'oneV of which is located in said Wall, the counter shaft eX- tending through said Wall, change speed gears between the driven shaft and the counter shaft, a pair of gears on the Counter shaft located on oppositey sides of said Wall, for meshing With the pair of gears on the driving shaft, the members of one of-said pairs of gears beingshiftable independently of eachv other into and out of mesh respectivelyy with the members of the other pair of thegears, and means for shifting the same."

3. In a change speed transmission gearing, thecombination of a main case, driving m' and driven shafts,l a countershaft, thedriving shaft being mounted at its'inner end in a bearingin a Wall of the main case, the driven shaft being mounted in the main case in alinement With the driving shaft, the countershaft being mounted in bearings in opposite Walls of the main case, a support having a bearing forthe outer end of the driving shaft, said support being mounted in the opening in the main case for the bearingfor the inner end of said driving sha-ft, change speed gears mounted on the driven shaft and on the countershaft, some of the gears being shiftable, means for shift,- ing the shiftable gears, change speed gears mounted on the driving shaft and the coun'- Jtershaft inside and outside of the main case, some of them being shiftable, and means for lshifting the same. I

4'. In a change speed transmission gearing, the combination of a main case, driving and driven shafts, a countershaft,`the driving shaft being mounted at its inner end in, a bearing in a Wall of the main case, the driven shaft being mounted in the casein alinement-With the driving shaft,othe countershaft being mounted 1n bearings 1n oppo..

site Walls of the main case, a supporthaving a bearing for the outer end of theA driving shaft, said support being mounted in the opening in the main case, for the bearing for the inner end of said driving shaft, change speed gears mounted on thev driven shaft and on the countershaft, some of the gears being shiftable, means for selecting andk shifting the shiftable gears, change speed gears mounted on the driving shaft and the countershaft inside and outside of the case, some of them being shiftable', and means for shifting the same, and a case enclosing the gears on the drive and countershafts located outside of the'main case, and the second mentioned case being mounted on said support, and secured to the main case.

5. In a change speed gearing, the combination ofa main case, driving and driven shafts, a countersha'ft, the driving shaft being mounted at its inner end in a bearing in a Wall of the main case, the" driven shaft being' mounted in the main case in axial alinement .vith the driving shaft, the counterslptft being `mounted in bearings in the kopposite Wall of the mainlcase, and extending outside of the mainAcase parallel to the driving shaft, change speed gears mounte y within the main case on the driven shaft and the counteish'aft, some of said gears .being shiftable, means Afor shifting the shiftable geavrs, change speed gears mounted on the driving shaft and the counter-shaft inside and outside of the main case, some of saidlgears being shiftable, and means for shifting the same.

6. In a change speed gearing, the combination of a main case, driving and driven shafts, a countershaftQthe driving shaft being mounted at its innerendin a gearing in a wall of the main case, the. driven shaft being mounted in the main case in axial alinement with the driving shaft, the countershaft being mounted in bearings in the opposite Wall of the main case, and extend- ,l 1,550,058 e I 5' l ing a pair of gears thereon, a' second shaft having a pair of gears, the gears of one pair being shiftable independently of each other into and out of mesh with the gears of the other pair respectively, means for shifting the shiftable gears, comprising a `reversely movable actuator, motion transmitting cams connected respectively to the shitable gears, the cams being movable independently of each other, and having active and dwell por-A tions, and the actuator having a follower coactin'g with the active and dwell portions of the cams, the .dwell portion of each cam being arranged to coact with the companion follower when the active portion of the other cam is coacting with its companion follower. v f

13. In a change speed transmission gearing, the lcombination of a driving shaft having a pair of gears thereon,- a second "shaftl having a'pai'r of gears, thegears of a reversely movable actuator, shifter rods l' connected respectively to the shiftable gears, said rods being provided with cams, each having an active and a dwell portion, the actuator comprising a'rock shaft having a rock arm provided with followers coacting respectively with the cams, the dwell portion of each cam `-being arranged to coact whh the companion follower when the active portion of the other camy is coacting with its companion.

In testimony whereof, I have hereunto l signed my name, at Syracuse, in the county of Ononda a, and State of New York this 15th day o October, 1923. i

' GEORGE o. carini/irri?.v 

